school. about age 13 to 18. >> reporter: gwen says self-injury is a growing trend mostly among girls. some have a history of abuse or depression others none at all. >> it could be anybody. these kids are just normal kids. >> reporter: they go to great lengths to hide their behavior making it difficult for parents to discover. >> to look for would be a child that insists on wearing long sleeves or jeans all the time even in warm weather who is very self-conscious and won't even push up their sleeves. some girls go so far as to cut their bellies or the bottoms of their feet in order to avoid detection. >> it's like an addiction once you get into it but the urge never completely goes away. >> reporter: they are proof that even extreme cases can be overcome. now they want to help others. >> as for specifics statistics on how many teens cut themselves there's for very studies that have been done. a study in 2005 surveyed 293 teens of those 195 reported cutting. they hope to create a group so those that are o flicked by this can learn they are not alone. >>> here is what's in the news now.